Tiny smoke particles that wafted from California wildfires near Mount Shasta across Colorado and on eastward into Kansas, Nebraska and Oklahoma now are blowing back over Colorado Front Range cities, government meteorologists said Monday morning.

This may explain the haze obscuring the mountains.

"The hazy conditions you are seeing out across the Plains are where the stuff from Kansas and Nebraska is being brought back into Colorado by the southeast winds," National Weather Service meteorologist Todd Dankers said. "We have not had a lot of rain to scour the atmosphere. So that smoke has been building day after day."

State health department monitors described metro air quality as good Monday morning. No health advisories were issued. However, visibility shortly after 12 p.m. was listed as poor.

"The haze is mostly attributed to smoke from fires in western states that the meteorology has been circling around for the past several days," state air quality control division spokesman Chris Dann said.

"Other than the smoke, there is absolutely nothing going on outside the ordinary for this time of year," Dann said.